Filter-press



(No Model.) 2 Sheets-Sheet 2. M. SWENSON.

FILTER PRESS.

No. 353,514. Patented Nov. 30, 1886.

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FILTER-PRESS.

SPECIPICATIQN forming part of Letters Patent No. 353.514, dated November 30, 1836.

Applicationfiltd May 3, 1856. Serial No. 100.918. (No model.)

T 0 all whom it may concern.-

Be it known that I, Macros Swanson, a citizen. ot' the United States, residing in Fort- Scott, Kansas, have invented certain Improvements in Filter-Presses, of which the following is a specification.

My invention relates to filterpresscs which are used for separating precipitated matters or other impurities from sugar or other-liquors, one object of my invention being to provide for the ready clamping of thesections or leaves ot' the press together and the ready loosening of the same when necessary, and a further object being to so construct the leaves of the press as to permit the ready washing out of any liquor which may remain in the cake formed between adjacent filtering-leaves of the press.

In the accompanying drawings, Figure 1 is a side view of a-tiltcr-press constructed in accordance with my invention; Fig. 2, a plan view of the same; Figs. 3 and 4, face views of different leaves of the press; Fig. 5, an enlarged section looking in the direction of the arrow 1, Fig. 3, and showing adjoining leaves of the press to illustrate the operation of filtering the liquid; and Fig. 6, a similar View of adjoining leaves of the press, looking in the direction of the arrow 2, Fig. 3, and showing the operation of washing the prcss-cakes.

The press consists, as usual, of a number of alternating sections or leaves, A B, suitably supported by means of logs a upon the opposite rods or bolts, Z), of the fixed frame, the leaves of the press being clamped between the fixed headD and the movable head F, so as to prevent any leakage through the joints between the leaves, which joints are preferably provided with suitable packing.

Usually the movable head of the press is acted upon by nuts on the screw-rods b b, and the process of tightening and loosening the press is a slow one, due to the necessity of tightening up and unscrewing these nuts. In order, therefore, to overcome this objection I dispense with the usual screw-rods and nuts as a means of tightening the press and use in place of the same two pairs of toggle-levers, G G, the lever G of each pair being provided with an adj ustingscrew, c, which has a bearing upon the head F. The other lever, G, of

each pair is secured to a rockshaft, d, which is provided with toothed quadrantsf, engaging with 'spur-wheelsf on a crank-shafaf by the rotation of which the pivotal con nections g of the togglelevers may be depressed so as to expand said togglelevers and thrust the head F of the press forward, or the pivots may be raised so as to contract the toggle-levers and withdraw the bearing ends of the lovers G from contact with the head F of the press, acounterbalance-weight, 71, connected to a. crossbar, h, on said levers G, facilitating the throwing up of said levers out of the way as soon as the ends of the same are free] The head F can then be readily run back on the supportingbolts b by rotating a crankshalt, i, adapted to hearings on said head F, and having spur-pinions i,engaging with fixed raeksj at the opposite sides of the frame.

In rcclaniping the press, the head F is run forward by means of the rack and piuons, the toggle levers being then depressed, the screws 0 adjusted to their bearings on the head, and the quadrantf operated so as to depress the joints 9, expand the levers, and tighten the press.

Although the toggle-levers afford a means of rapidly tightening and loosening the press, they provide a means of exerting greatpressure upon thehead F, this pressure increasing as the leaves of the press are forced together and the pivotal connections 9 of the toggle-levers approach nearer and nearer to a line drawn through the bearings ot' the levers and thecenter of the shalt d.

The quadrant may be operated to such an eX- tent that the pivots g are carried to or slightly below this line, so that the levers will belocked and any back movement of the head prevented.

The leavcs B of the press are the filteringleaves, and carry opposite wire-guaze or perforated plate-screens which support the filtering-cloths, said screens being braced by transverse partitionsm, suitably notched or perforated to permit the flow of the liquid through the space between the screens to the valved outlet at at the lower portion of the leaf.

All of the leaves of the press have at one side hollow lugs 10, these lugs, when the leaves of the press are clamped together, forming a passage, 00, which is blank on all of the leaves B, but communicates through ports 00 in the leaves A, Fig. 3, with the spaces inclosed by' said leaves and betweenthe filtering-faces of opposite leaves, B, of the press. The liquid to be filtered is pumped intothese spaces and filtered through the filtering-cloths into the interior of the leaves B, from which it flows, as before remarked, through the valved escape-pipes at the bottom. (See Fig. 5.) The interiorof each leaf A soon becomes filled with a cake'of the precipitates and other impurities carried by the liquid, and this press-cake contains a considerable percentage of liquid, which it has been heretofore found difficult to remove, for if any attempt is made to wash the liquid from the cake by forcing water through the passage as and ports x this water will escape at once into the filtering-leaves B, and a comparatively limited portion only of each cake at and near the port 00 will be washed, while if, on the other hand, the cake is removed, broken up, and washed with clean water'the percentage of valuable matter in the resultant wasl1-water is,very slight.

In order, therefore, to permit the thorough washing of each cake in the press, I provide the leaves A and B of the same with supplementary lugs w, forming a passage, g, which is blank on the leaves A, but communicates throughports y with the interiors of some of the filtering-leaves B of the presssay with every alternate leaf, as shown' in Fig. 6. By this means when the leaves A of the press have become filled with a cake, as shown, water may be caused to pass through the passage y and ports y and to enter the interiors of the filtering-leaves with which said ports communicate, the escape-valves n of these leaves, of course, being closed. Water will thuspass from the filtering-leaves through the cakes in the adjacent leaves A, and into the intermediate filtering-leaf, as shown, for instance, by the arrows in Fig. 6, this flow of water being uniform throughout all portions of the cake,

and thoroughly, and by the use of a minimum amount of fresh water. The resultant wash- I am aware that toggle-levers are commonly used as parts of pressu re-imparting mechanism in different forms of presses, and hence I lay no claim,'broadly, to the use of toggle-levers as a means of imparting pressure to the movable head of the press; nor do I claim, broadly, the washing of the filter-cake by passing water through the same from one filtering-leaf to another, as this has been heretofore proposed; but

I claim as my invention- 1. The combinationof the heads and leaves of afilter-press with a pressure device acting upon but disconnected from the movable head of the press and pivoted so as to be thrown up out of the way, all substantially as described.

2. The combination of the heads and leaves of a filter-press, a pi voted pressure device acting upon but disconnected from the movable head of the press, and a counterbalance-weight for facilitating the elevation of said pressure device when it is withdrawn from contact with the head, all substantially as specified.

'3. The combination of the heads and leaves of the press, and a pressure device acting upon but disconnected from the movable head of the press, with pinions carried by said head, and fixed racks with which said pinions engage, whereby the head can be run to and fro when free from the control of the pressure device, all substantially as specified.

4. The combination, in a filter-press, of dis- MAGNUS SWENSON.

\Vitnesses:

' WILLIAM G. GIBBoNs,

SAML. G. BIDDLE. 

